No way.
Greatest athlete, to me, means someone who transcends a single sport. Guys like Bo Jackson, Deion Sanders, Wilt Chamberlain, and Herschel Walker. Being a great wrestler doesn’t necessarily mean someone is a great athlete. For all we know, Karelin couldn’t even catch a ball.
Bo Jackson is always my instant reaction when someone mentions greatest athlete. I’ve heard of Wilt’s greatness in Track & Field, but there’s only two things that I think of when it comes to Wilt: 100 pt game and, well, you know.